#[non_exhaustive]pub enum MitigationActionType {
AddThingsToThingGroup,
EnableIotLogging,
PublishFindingToSns,
ReplaceDefaultPolicyVersion,
UpdateCaCertificate,
UpdateDeviceCertificate,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against MitigationActionType
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let mitigationactiontype = unimplemented!();
match mitigationactiontype {
MitigationActionType::AddThingsToThingGroup => { /* ... */ },
MitigationActionType::EnableIotLogging => { /* ... */ },
MitigationActionType::PublishFindingToSns => { /* ... */ },
MitigationActionType::ReplaceDefaultPolicyVersion => { /* ... */ },
MitigationActionType::UpdateCaCertificate => { /* ... */ },
MitigationActionType::UpdateDeviceCertificate => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when mitigationactiontype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant MitigationActionType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
MitigationActionType::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant MitigationActionType::NewFeature
is defined.
Specifically, when mitigationactiontype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on MitigationActionType::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
AddThingsToThingGroup
EnableIotLogging
PublishFindingToSns
ReplaceDefaultPolicyVersion
UpdateCaCertificate
UpdateDeviceCertificate
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
Source§impl MitigationActionType
impl MitigationActionType
Sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
Source§impl AsRef<str> for MitigationActionType
impl AsRef<str> for MitigationActionType
Source§impl Clone for MitigationActionType
impl Clone for MitigationActionType
Source§fn clone(&self) -> MitigationActionType
fn clone(&self) -> MitigationActionType
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for MitigationActionType
impl Debug for MitigationActionType
Source§impl Display for MitigationActionType
impl Display for MitigationActionType
Source§impl From<&str> for MitigationActionType
impl From<&str> for MitigationActionType
Source§impl FromStr for MitigationActionType
impl FromStr for MitigationActionType
Source§impl Hash for MitigationActionType
impl Hash for MitigationActionType
Source§impl Ord for MitigationActionType
impl Ord for MitigationActionType
Source§fn cmp(&self, other: &MitigationActionType) -> Ordering
fn cmp(&self, other: &MitigationActionType) -> Ordering
1.21.0 · Source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Source§impl PartialEq for MitigationActionType
impl PartialEq for MitigationActionType
Source§impl PartialOrd for MitigationActionType
impl PartialOrd for MitigationActionType
impl Eq for MitigationActionType
impl StructuralPartialEq for MitigationActionType
Auto Trait Implementations§
impl Freeze for MitigationActionType
impl RefUnwindSafe for MitigationActionType
impl Send for MitigationActionType
impl Sync for MitigationActionType
impl Unpin for MitigationActionType
impl UnwindSafe for MitigationActionType
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